The U.S. spec 5.7L Hemi (in the GC) is rated at 268 kW and 529 N.m, 9 kW and 9 N.m more than the Aussie version. Peak power is also reached at 50 less RPM and peak torque at 50 more RPM here in the US versus Australia. I doubt that would translate to a much slower 0-60 time, but it would have some effect. The gas mix also may be different in Australia, and it might not perform as well as the gas in the US. The transmissions could also be tuned to shift differently in Australia, maybe shifting lower to improve efficiency (gas prices in Australia are ~$2 higher than gas prices in the US), resulting in a detrimental effect on acceleration. A combination of those things, in addition to human error when timing, could easily result in the difference in 0-60 times.

The U.S. spec 5.7L Hemi (in the GC) is rated at 268 kW and 529 N.m, 9 kW and 9 N.m more than the Aussie version. Peak power is also reached at 50 less RPM and peak torque at 50 more RPM here in the US versus Australia. I doubt that would translate to a much slower 0-60 time, but it would have some effect. The gas mix also may be different in Australia, and it might not perform as well as the gas in the US. The transmissions could also be tuned to shift differently in Australia, maybe shifting lower to improve efficiency (gas prices in Australia are ~$2 higher than gas prices in the US), resulting in a detrimental effect on acceleration. A combination of those things, in addition to human error when timing, could easily result in the difference in 0-60 times.

That's right none of this should make a huge difference to the time. Even a different transmission tune wouldn't do too much when you floor it as long as it revs out to peak rpm.

It's interesting that Jeep Aus used to rate the previous model hemi at 7.4 seconds for 0-100km/h. Sure the wk2 weighs a little more, but also has more power.

However, most of us with the Hemi do have 4x4 Jeeps which are heavier and less efficient than yours. Moreover, you have the tuner and some mods that certainly help with the 0-60 times. Contrary to my previous beliefs, your case makes me think that perhaps the times on the Aussie site for the stock Hemi are not that off.

Hopefully, the 8 speed transmission will help but meanwhile we have to wait until the folks with the 2014 start posting some numbers

I'd expect the 2014 5.7L HEMI V8 to go 0-60 in somewhere between 6-6.5 seconds (at sea level, stock). The CNET review of a 3.6L Pentastar V6 Summit gave a 0-60 time of 7.5 seconds, which is about a second faster than the 2011-2013 equipped with the 5 speed transmission. Because of this, I think it is reasonable to assume the V8, which clocked in around 7 seconds with the 6 speed (2011-2013) will also improve by .5-1 second. Someone on the forum (I forged who/where) tested the 2014 by hand and got 6.3 seconds, which is most likely within half a second (+/-) of the actual time. I also saw the 2013 Ram 1500 with the 5.7L and 6 speed did 0-60 in 6 seconds. The Ram weighs about the same as the GC but has 30 more HP, but I think the 8 speed transmission can make up at least .5 seconds of the difference. When my V8 Overland gets here (eventually ) I will do some runs to find out the actual times. I live within a few hundred feet of sea level so my times should be about as good as they get.

I'd expect the 2014 5.7L HEMI V8 to go 0-60 in somewhere between 6-6.5 seconds (at sea level, stock). The CNET review of a 3.6L Pentastar V6 Summit gave a 0-60 time of 7.5 seconds, which is about a second faster than the 2011-2013 equipped with the 5 speed transmission. Because of this, I think it is reasonable to assume the V8, which clocked in around 7 seconds with the 6 speed (2011-2013) will also improve by .5-1 second. Someone on the forum (I forged who/where) tested the 2014 by hand and got 6.3 seconds, which is most likely within half a second (+/-) of the actual time. I also saw the 2013 Ram 1500 with the 5.7L and 6 speed did 0-60 in 6 seconds. The Ram weighs about the same as the GC but has 30 more HP, but I think the 8 speed transmission can make up at least .5 seconds of the difference. When my V8 Overland gets here (eventually ) I will do some runs to find out the actual times. I live within a few hundred feet of sea level so my times should be about as good as they get.

I believe that I would be around 6.5 with the stock wheel and tire setup. You have to remember my tires have effectively changed my gear ratio higher. Stock tire diameter is 30.5" and I'm at 31.5" plus the added weight of the 22" wheels and tires.

I believe that I would be around 6.5 with the stock wheel and tire setup. You have to remember my tires have effectively changed my gear ratio higher. Stock tire diameter is 30.5" and I'm at 31.5" plus the added weight of the 22" wheels and tires.

I understand. I wasn't responding to any post, just stating what made sense to me . Your time was impressive for your setup!

P.S.- I stumbled upon your Instagram account while searching for pictures of the GC

Also consider that none of those timers that ate built into a tuner or GPS are acurate. Car magazines use pretty expensive stuff. The best way to calibrate it is to run it down a track. Then compare the 330', 660' and 1/4 mile times. If it matches, then it is right on, if not, you know how far it is off. The new 8 spd should help the V6 more than the hemi, but it will definitely be quicker on both models.

Also consider that none of those timers that ate built into a tuner or GPS are acurate. Car magazines use pretty expensive stuff. The best way to calibrate it is to run it down a track. Then compare the 330', 660' and 1/4 mile times. If it matches, then it is right on, if not, you know how far it is off. The new 8 spd should help the V6 more than the hemi, but it will definitely be quicker on both models.

Haha! I guess you could do that to check but its accurate enough. I mean how difficult is it to program a timer to start when the vehicle moves and stop when it hits 60. We don't need to take it out one thousandth of a second. I bet it's pretty damn close....at least the DiabloSport one. I don't know about the GPS style that you referred to.

You'd be surprised how much they can be off. They have a g force meter. Sometimes it takes a little before it goes. I've seen some say the car was quicker and some say slower. Sometimes by several tenths to a half second. So saying a jeep runs 6.5 to 60 could be over 7. Also the guy who got 8 seconds might be 7.5.